>>I'm not enjoying this. I'm paying for this afterall. I understand the process and how it needs to be handled, but it certainly is not an enjoyable process!
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>I am doing my best. This is a process of a two years work to convert a 10 year product. Since January, I have been on it 18 hours a day and I am trying to finish it asap. Without this migration, I cannot make this product evolve and its support was at a point where it was extremely difficult. This product is really big and it cannot be converted on one shot. This path has been chosen in order to keep it running on a daily basis. I still have about 10% to go.

Hang in there. If you had a department of developers and testers at your disposal I know this would be done differently, but that's not the case. All I have noticed are minor issues like color changes and temporarily missing toolbar buttons, nothing that has prevented me from using the site.

I'm sure you will be happier than any of us when those 16 hour days come to an end!